<?php 
	header("Content-type: text/html; charset=utf-8");
	$c="我是什么呢";
   $a=90;
   $b=&$a;
   $b=100;
   // echo $a;
   // echo "<br>";
   // echo $b;

   var_dump($a);
   echo "<br>";
   var_dump($c);

   $num=50;

   if ($num>50) {
   	echo "我大于50";
   }elseif ($num>60) {
   	echo "我大于60";
   }else{
   	echo "我小于50";
   };
   echo "<br>";

   switch ($num) {
   	case '60':
   		var_dump('我等于60');
   		break;
   	case '50':
   		var_dump('我等于50');
   		break;
   	default:
   		var_dump('我没有找到答案');
   		break;
   }
   echo "<br>";
   do {
   		echo "我大于等于10";
   } while ( $num<= 10);




 ?>